Comparative Reactions of Corn Inbreds to Oospore and Conidial Inoculum ofPeronosclerospora sorghi

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Abstract
Corn [Zea mays] inbreds that differed in reactions to infection by oospores of P. sorghi in field trials for susceptibility to sorghum downy mildew were tested for reactions to conidia of P. sorghi. The cultivars were inoculated with conidia at germination and at the 1st-, 2nd- and 3rd-leaf stages of growth. All inbreds were susceptible at germination. Inbreds that were resistant to oospores developed resistance to conidia at or before the 2nd leaf stage. Inbreds susceptible to oospores in the field were susceptible to conidia at the 2nd-leaf stage. The percentages of downy mildew in corn inbreds inoculated with conidia at the 2nd-leaf stage were closely correlated with the percentages of downy mildew induced by natural infection of these inbreds in the field.